Dan is the dark side of Adam ( for more details about this character read the 3rd chapter of this book ) and is a demon. Dan has a sister twin called Fang ( the dark side of Annicon, for more details about Fang then read the 2nd chapter of this book, and is a demon ). Dan also has two little brother's one is called Jaw ( the dark side of Nolan, for more details about Jaw read the 10th chapter of this book, and is a demon ) and another one of his two little brother's is Mini ( the dark side of Nathan, for more details on Mini read the 11th chapter of this book, and is a demon ). Dan is the sun of Coffee ( the dark side of Hiccup, from How To Train Your Dragon, and is a demon ) and comet ( the dark side of Astrid, from How To Train Your Dragon, and is a demon ).
